Governor-actuated valve



G. J. RACKHAM- GOVERNOR ACTUYATED VALVE. APPLICATION FILED JAN. 29, 1920Patented Feb. 1, 1921.

' hr 0' WET-we GEORGE JOHN RAGKI-IAM, or rU'rNEY, LONDON, ENGLAND.

GOVERNOR-ACTUATED VALVE.

Specification of Letters Patent.

Patented Feb. 1, 1921.

Application filed January 29, 1920. Serial No. 354,965.

Needle valves as used in carburetors are of small diameter and very finetaper and with continued working of the needle on its seat excessivewear takes place. Now it is one object of the present invention toprevent this excessive wear of the needle or its seating and weaccomplish this by employing means which limit the closing movement ofthe needle. 1

This invention comprises broadly a gov ernor valve provided with meansfor limiting its motion so that in the closed position it neverel'lgages in seating under pressure. 111 a nothcr aspect this inventionmay be stated to :onsist of a spring biased or balanced needle valveadapted to throttle down or cut oil' the supply without pressure contacton its seating. Further features will be described in connection withthe accompanying drawing.

The drawin illustrates the aresent invenmuch of an ention partly insection and so for nnderstan dgine cylinder as is necessary ing same.

In the drawing 1 designates the inner wall of an engine cylinder, 2 thewater jacket, 3 the outer wall and 4 the body of a carbureter integraltherewith or secured thereto. Below the jet 5 is a chamber 6communicating with the float chamber 7 by a duct 8 the up per end ofwhich is provided with a seating for the needle 9.

As pointed out above continued operation of the needle causes excessiveWear when it is seated under pressure.

To eliminate such pressure the needle is provided with an enlarged bodyportion which passes through a tube 10 to a point outside the carburetorbody or casing. The needle is normally urged into the full open positionby a spring 11 engaging the flange or head 12 of the needle.

Between the tube 10 and the spring 11 is a distance piece or sleeve 13the height of which is such that it arrests the movement of the needledownwardly just when it makes bare contact with the seating that is tosay before pressure can force it hard on to the seating.

The height of distance piece 13 can be determined so that the needlenever actually touches its seating yet will throttle down the fuelsufficiently to either stop the engine or just keep it slowly turningover.

To prevent air escaping from the float chamber in cases where thatchamber contains air under pressure the bottom of tube 10 is locatedbelow the level of the fuel in the carburetor. Moreover the bod of theneedle within the tube may be provided with a series of annular groovesas shown to form liquid seals to prevent air escaping.

The valve rocker 14: carried bythe pin or shaft 15 mounted in the lug orlugs 16 has an arm 17-shown dotted-engaging by means of a forked endwith the control rod 18 which moves back and forth along its axis inresponse to variationsin engine speed. This rod 18 is screw threaded andis embraced by a spring-19 engaging at one end a nut or collar. 20 andat the other end the fork on arm 17.

The wing nut 22 serves for adjusting the valve as will be readilyunderstood. The motion of the rod 18 is controlled in any of the wellknown ways in which governor rods are controlled.

Various modifications may be made in the construction, that shown beingby way of example only.

I claim.

1. Valve mechanism, comprising in combination a valve needle, a seatingtherefor. a guide for said valve needle, a rocker en gaging said valveneedle, a reciprocatable rod responsive to variations on engine speedengaging said rocker whereby the rocker and valve needle are actuated, ahead on said valve needle, a spring normally urging the valve away fromits seating and a stop engaging said head to limit the closing movementof said valve needle.

2. Valve mechanism comprising in combination a valve needle, a seatingtherefor, a guide for said valve needle, a rocker engaging said valveneedle, a reciprocatable rod responsive to variations in engine speedengaging said rocker whereby the rocker and valve needle are actuated, ahead on said valve needle, a spring normally urging the valve away fromits seating, a stop serving to limit the closing movement of said valveneedle and means on said reciprocatable rod for adjusting said valveneedle.

3. Valve mechanism comprising in com bination a valve needle, a seatingtherefor, a guide for said valve needle, a rocker engaging said valveneedle, a reeiproeatable rod responsive to variations in engine speedengaging said rocker Whereb T the rocker and valve needle are actuated,a head on said valve needle, a spring normally urging the valve awayfrom its seating, a stop serving to limit the closing movement of saidvalve needle a collar on said reciprocatable rod, a spring interposedbetween said collar and a forked'arm on the rocker and an adjustable nuton said rod engaging said forked arm to adjust the valve needle.

governor actuated carbureter valve comprising in combination acarbureter bod a fioat chamber therein adapted to contain fuel and gasunder pressure, a valve needle a guide tube therefor terminating belowthe level of the fuel, liquid seals formed between said needle and guidetube, a distance'piece outside the carbureter body and surrounding saidguide tube, a head on the valve needle, a spring surrounding saiddistance piece and interposed between the carburetor body and saidneedle head, a valve rocker an arm on said rocker engaging said needle,a second arm on said rocker forked at its free end, a control rod themovements of Which are responsive to variations in engine speed, meansfor operatively connecting said control rod to the forked arm of therocker and means for adjusting the anguneedle, a guide tube for said larposition of said rocker and the movement of the needle valve.

5. Governor actuated valve mechanism comprising in combination a fluidreservoir,

a valve seating therein, a valve needle, :1 guide therefor, a valverocker, a control rod operatively connected to said rocker andresponsive to variations in engine speed, a stop limiting the closingmovement of said needle, a spring normally urging said needle awn fromthe seating, liquid seals embraeing the needle Within said guide andmeans for ad justing the angular position of the rocker at apredetermined speed.

6. A governor actuated valve for earbureters comprising in combination aIluid reservoir, a valve seating therein, a valve needle, a guide tubefor said needle, a spring normally tending to open the valve. a governorcontrolled rocker operable to (lose the valve and a stop limiting theclosing movement of the needle to prevent pressure eontact on itsseating.

7. A governor actuated valve for can bureters comprising in combinationa fluid reservoir. a valve seating therein, a valve needle a springnormally tending to open the valve. a governor controlled rockeroperable to close the valve a stop limiting the elcsing movement of theneedle to bare contact with its seating. liquid seals in said guidetube. and means ior adjusting the angular position of the rocker on itspin.

Signed at London this 12th day oi" .lauuary, 1920.

GEORGE JOHN RACKIIA M.

In the presence of- Lois BnA'rnIon CUASTEAYNl-JUF, THOMAS E. Ronnn'rsoN.

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